Endpoint · computeGETapi.duoleads.com /v1/id/national ?country=NL&kind=bsn&value=111222333
Validate a national identity, tax or company registration number against its country's official checksum rule.
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Validate a national identity, tax or company registration number against its country's official checksum rule. Covers 23 countries including NL BSN, ES NIF/NIE/CIF, IT codice fiscale, FR SIREN/SIRET, DE Steuer-ID, BE/PL/CZ national numbers, SE/NO/DK/FI personal numbers, BR CPF/CNPJ, AU ABN/TFN, UK NINo, IE PPS, US NPI/EIN. Structure and check digit only — no registry lookup; the number itself is never stored (logs keep only its length and character types).Overview
Grade?
UNRATED
0 of 30 paid calls toward a letter
Price
$0.05 per call
Paid calls
none yet
delivery unknown until someone pays
More info
Seller?
URL
https://api.duoleads.com/v1/id/national?country=NL&kind=bsn&value=111222333
MCP server on this host: com.duoleads.api/data-utilities
Seen
first 5 days ago · last 19 hr ago
9 free handshakes
Payment
Pays through
x402
Offered on?
Base USDC
Listed on?
Base
Score, from free handshakes onlyweights 2026.09.6
UN
RATED
RATED
0.591 liveness verified, no letter
To a letter · 30 paid calls
0 of 30
Held back by sample size, not by the seller · gap to 1.000 is 0.409: 0.409 uncertain ? + 0.000 short ? · 0.059 to C
| Component | Weight | Measured | Lower bound ? | Adds | Short ? | Uncertain ? | |
|---|---|---|---|---|---|---|---|
| livenesscosts the most it answered at all |
0.60 | 1.00 | 0.318 | 0.191 | 0 | −0.409 | |
| latency p95 it answered as fast as its class |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| price stability the price stayed where it was listed |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| Composite | 1.00 | 0.591 | gap to 1.000 = 0.409 · 0.000 short · 0.409 uncertain | 0.591 | −0.000 | −0.409 |
Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check
The multiplication, written out
0.600 × 0.318 liveness
+ 0.200 × 1.000 latency p95
+ 0.200 × 1.000 price stability
= 0.591 → UNRATED: 9 of 30 paid calls weights 2026.09.6 · 9 samples · seed cap_01M3NV250Y0EXC88FEZ80CFV5Q|2026-09-04T22:24:24.290Z|2026.09.6
Verify it yourself
npx teppi-check https://api.duoleads.com/v1/id/national?country=NL&kind=bsn&value=111222333curl -s https://api.teppi.xyz/v1/trust/cap_01M3NV250Y0EXC88FEZ80CFV5Q